| Singles | |
|---|---|
| 2021 Città di Forlì III | |
| Champion |  Pavel Kotov |
| Runner-up |  Andrea Arnaboldi |
| Final score | 6–4, 6–3 |
Maxime Cressy was the defending champion [1] but lost in the quarterfinals to Vitaliy Sachko.
Pavel Kotov won the title after defeating Andrea Arnaboldi 6–4, 6–3 in the final.
Maxime Cressy (quarterfinals) Federico Gaio (first round) Salvatore Caruso (first round)
Zizou Bergs (first round)
Mirza Bašić (quarterfinals)
Vitaliy Sachko (semifinals, retired) Andrea Vavassori (first round) Andrea Arnaboldi (final)| Semifinals | Final | ||||||||||||
| 6 | Vitaliy Sachko | 4 | 0r | ||||||||||
| Pavel Kotov | 6 | 4 | |||||||||||
| Pavel Kotov | 6 | 6 | |||||||||||
| 8 | Andrea Arnaboldi | 4 | 3 | ||||||||||
| 8 | Andrea Arnaboldi | 4 | 6 | 6 | |||||||||
| WC | Luca Nardi | 6 | 3 | 4 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Cressy | 6 | 6 | ||||||||||||||||||||||||
 J Sels | 3 | 2 | 1 | M Cressy | 77 | 6 | |||||||||||||||||||||
 Marek Gengel | 2 | 6 | 2 | WC | M Gigante | 63 | 2 | ||||||||||||||||||||
| WC | M Gigante | 6 | 3 | 6 | 1 | M Cressy | 64 | 62 | |||||||||||||||||||
 B Lock | 3 | 1 | 6 | V Sachko | 77 | 77 | |||||||||||||||||||||
| Q | Daniele Capecchi | 6 | 6 | Q | D Capecchi | 77 | 1 | 2 | |||||||||||||||||||
 A Erler | 6 | 2 | 2 | 6 | V Sachko | 64 | 6 | 6 | |||||||||||||||||||
| 6 | V Sachko | 3 | 6 | 6 | 6 | V Sachko | 4 | 0r | |||||||||||||||||||
| 4 | Z Bergs | 5 | 77 | 5 | P Kotov | 6 | 4 | ||||||||||||||||||||
| P Kotov | 7 | 65 | 7 | P Kotov | 7 | 6 | |||||||||||||||||||||
| Q | K Smith | 7 | 6 | Q | K Smith | 5 | 2 | ||||||||||||||||||||
| Alt |  V Vacherot | 5 | 4 | P Kotov | 6 | 6 | |||||||||||||||||||||
| David Poljak | 7 | 4 | 3 | 5 | M Bašić | 2 | 3 | ||||||||||||||||||||
| L Miedler | 5 | 6 | 6 | L Miedler | 2 | 3 | |||||||||||||||||||||
| Q | S Danilov | 3 | 4 | 5 | M Bašić | 6 | 6 | ||||||||||||||||||||
| 5 | M Bašić | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | A Arnaboldi | 6 | 4 | ||||||||||||||||||||||||
| R Brancaccio | 2 | 1r | 8 | A Arnaboldi | 6 | 4 | 7 | ||||||||||||||||||||
| G Brouwer | 6 | 6 | G Brouwer | 4 | 6 | 5 | |||||||||||||||||||||
| PR |  J Lenz | 2 | 3 | 8 | A Arnaboldi | 6 | 6 | ||||||||||||||||||||
 M Pervolarakis | 6 | 6 | M Pervolarakis | 4 | 3 | ||||||||||||||||||||||
| Q | Luca Potenza | 3 | 4 | M Pervolarakis | 6 | 6 | |||||||||||||||||||||
| PR | F Baldi | 6 | 6 | PR | F Baldi | 4 | 4 | ||||||||||||||||||||
| 3 | S Caruso | 2 | 3 | 8 | A Arnaboldi | 4 | 6 | 6 | |||||||||||||||||||
| 7 | A Vavassori | 4 | 2 | WC | L Nardi | 6 | 3 | 4 | |||||||||||||||||||
| WC | L Nardi | 6 | 6 | WC | L Nardi | 78 | 6 | ||||||||||||||||||||
 M Copil | 77 | 3 | 3 | A Vatutin | 66 | 4 | |||||||||||||||||||||
| A Vatutin | 64 | 6 | 6 | WC | L Nardi | 6 | 6 | ||||||||||||||||||||
| M Viola | 77 | 4 | 7 | A Šetkić | 0 | 4 | |||||||||||||||||||||
| WC | L Rosol | 61 | 6 | 5 | M Viola | 1 | 3 | ||||||||||||||||||||
| A Šetkić | 7 | 6 | A Šetkić | 6 | 6 | ||||||||||||||||||||||
| 2 | F Gaio | 5 | 2 | ||||||||||||||||||||||||
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